Dear all, I have a dataframe of the following strucutre
numacc_b coverage_b Geschlecht GG 1 0 1 W A 2 0 1 M A 3 0 1 M B 4 0 1 M B 5 0 1 W A 6 0 1 M B I would like to form a subset consisting of all entries with Geschlecht=M and GG=A. Using >T1 <- subset(daten1, Geschlecht=="M", GG=="A") delievers data frame with 0 columns and 6 rows > T1 <- subset(daten1, Geschlecht=="M") delievers numacc_b coverage_b Geschlecht GG 2 0 1 M A 3 0 1 M B 4 0 1 M B 6 0 1 M B 9 0 1 M B 10 0 1 M B But I want to select the dataframe according to both factos. What can I do? Thank you answers in advance! Best, Martin -- GMX DSL Doppel-Flat ab 19,99 €/mtl.! Jetzt auch mit gratis Notebook-Flat! http://portal.gmx.net/de/go/dsl ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.